A highly controlled clinical study in Iquitos, Peru shows that a spatial repellent used as an intervention tool “significantly lowered the risk” of virus transmission by the yellow fever mosquito, Aedes aegypti, according to a team of 25 international scientists, including UC Distinguished Professor Thomas Scott and UC Davis project scientist Amy Morrison.  

The parallel, cluster-randomized, controlled trial revealed that a spatial repellent,  currently under review by the World Health Organization (WHO), reduced human Aedes-borne virus infection by 34.1 percent. 

“That is a significant statistical and public health reduction,” said Scott, an internationally recognized medical entomologist who retired from the UC Davis Department of Entomology and Nematology in 2015 but continues his scientific research on the ecology and epidemiology of dengue, a mosquito-borne viral infection transmitted mainly by A. aegypti. Dengue, one of the most rapidly increasing vector-borne infectious diseases, infects some 400 million people a year,  with 4 billion people at risk annually. 

The clinical study results mean that spatial repellents have “the potential to reduce a variety of vector-borne diseases, augment existing public health efforts, and can be an effective component in vector control intervention strategies,” Scott said. 

The newly published research, “Efficacy of a Spatial Repellent for Control of Aedes-borne Virus Transmission: A Cluster-Randomized Trial in Iquitos, Peru,” appears in the Proceedings of the National Academy of Sciences (PNAS). The Bill and Melinda Gates Foundation funded the research in a grant to the University of Notre Dame (UND). Medical entomologist Nicole Achee, a research professor at UND, served as the project leader.  

“We are thrilled by the results and public health impact of this trial,” said Scott, who began working on dengue research in Iquitos in September 1998. “Randomized control trials of Aedes-transmitted viruses are complicated and logistically difficult to carry out, which helps explain why so few have been completed even though the data they generate is desperately needed.” 

“To have shown a substantial public health impact at an endemic site, is rewarding,” said Scott, now a resident of Luck, Wis. “Our results provide valuable new data on mosquito control that will help to fill long-standing knowledge gaps and improve guidance for development of enhanced public health policy. Because literally billions of people around the globe are at risk of infection and disease from these viruses we are encouraged that results from our trial will contribute to improved health and well-being of so many people.” 

Epidemiologist Amy Morrison, a 1996-2018 project scientist with the UC Davis Department of Entomology and Nematology and now with the UC Davis School of Veterinary Medicine's Department of Pathology, Microbiology and Immunology, served as the lead author of the PNAS paper. “This trial was the most logistically challenging field project I've ever participated in,” she said.  “I led the field efforts in Iquitos, Peru where I have resided since 1998.  Our research team continued to amaze me; they had to replace more than 20,000 products in more than 2,000 houses every 15 days and managed  80 percent coverage of participating houses.  This type of vector control trial is very difficult to carry out so demonstrating protective efficacy is very gratifying.” 

Achee said the Peru study outcomes “are a critical component to achieving our goals for supporting a WHO policy endorsement for spatial repellents. The reduction in Aedes-borne virus infection in at-risk participants seen in trial results have fundamentally contributed to the WHO encouraging further consideration for the use of this product class in public health worldwide. This is a historical milestone that was led by the UC Davis implementing team and I am thrilled to have been part of the collaborative effort." 

Spatial repellents are “devices that contain volatile active ingredients that disperse in air,” the authors explained. “The active ingredients can repel mosquitoes from entering a treated space, inhibit attraction to human host cues, or disrupt mosquito biting and blood-feeding behavior and, thus, interfere with mosquito–human contact. Any of these outcomes reduce the probability of pathogen transmission.” 

In their study, the scientists quantified the impact of a transfluthrin-based spatial repellent on reducing human infection. The repellent is known as a fast-acting pyrethroid insecticide with low persistency.  “From 2,907 households across 26 clusters (13 clusters each in treatment and control arm), 1,578 participants were assessed for evidence of infection (i.e., seroconversion) by survival analysis. Incidence of acute disease was measured among 16,683 participants,” they wrote in their abstract. “Adult mosquito collections were conducted to compare Ae. aegypti abundance, blood-fed rate, and egg laying status through mixed-effect difference-in-difference analyses. The spatial repellent significantly reduced human Aedes-borne virus infection by 34.1%, which was a significant statistical and public health reduction. Aedes aegypti abundance and blood-fed rates, secondary outcomes, were significantly reduced by 28.6% and 12.4%, respectively.”

More than half of the world population is at risk for infection with viruses transmitted by Aedes mosquitoes, including include dengue, Zika, chikungunya, and yellow fever, the scientists wrote.

Vector interventions are needed for Aedes-borne viral (ABV) disease prevention “but their application is hindered by the lack of evidence proving they prevent infection or disease," they wrote. "Results from our ABV study will help guide public health authorities responsible for operational management and worldwide ABV disease control and incentivize new strategies for disease prevention.” 

 “The primary mosquito vector, Aedes aegypti, thrives in modern tropical urban environments. Despite decades of effort to control Ae. aegypti populations and prevent disease, the geographic range of illness and the viruses this mosquito transmits continue to expand,” they related. “Rigorously proven vector control interventions that measure protective efficacy against Aedes-borne viruses are limited to Wolbachia in a single trial in Indonesia and do not include any chemical interventions. Spatial repellents, a new option for efficient vector control, are designed to decrease human exposure to Aedes-borne viruses by releasing active ingredients into the air that disrupt mosquito–human contact and, thus, reduce the risk of human infection.” 

They noted that “Spatial repellents are increasingly being recognized as a flexible class of vector control products with positive public health applications that go beyond Aedes-borne viral diseases. For example, transfluthrin- and metofluthrin-based mosquito coils can reduce malaria. The same spatial repellent device used in the Iquitos trial reduced malaria infections in an Indonesia trial. Spatial repellents, therefore, have the potential to reduce a variety of vector-borne diseases, augment existing public health efforts, and can be an effective component in vector control intervention strategies.” 

The Iquitos trial is one of two trials recommended by WHO for assessing public health value and developing global health policy for the intervention class of spatial repellents. “Fully integrating vector control into Aedes-borne viral disease prevention programs requires quantitative guidance based on quantitative measures of the impact from each intervention component,” the authors wrote. “Ministries of Health, local to national governments, and nongovernmental organizations can use the Peru trial results as an evidence base for informed application of spatial repellents. Considering the growing public health threat from Aedes-borne viral disease, difficulties of developing vaccines against multiple viruses, and past poorly informed vector control failures, enhanced Aedes-borne viral disease prevention will benefit greatly from interventions, like the Peru trial, with proven public health value. 

Thomas Scott. Scott, a member of three WHO committees and one of the world's Highly Cited Researchers for the third consecutive year, co-chairs a Lancet Commission that focuses on how prevention of viruses transmitted by Aedes mosquitoes.  He served on the faculty of the Department of Entomology, University of Maryland, from 1983 to 1996 before joining the UC Davis entomology faculty as a professor of entomology and director of the Vector-Borne Disease Laboratory. Highly honored by his peers, Scott won the coveted Harry Hoogstraal Medal from the American Society of Tropical Medicine and Hygiene in 2018. He is a fellow of the American Society of Tropical Medicine and Hygiene, Entomological Society of America, and the American Association for the Advancement of Science.  He holds bachelor and master's degrees from Bowling Green (Ohio) State University and a doctorate in ecology in 1981 from Pennsylvania State University.

Amy Morrison. Morrison, who holds a doctorate in public health from Yale University, with a concentration in epidemiology of infectious diseases, and a master's degree in public health from UCLA, has served as the principal investigator, co-principal investigator and a collaborator on a number of federally funded grants. She specializes in the epidemiology of tropical vector-borne diseases, with an emphasis on (1) arthropod vector ecology and dengue virus transmission dynamics and (2) spatial and temporal analyses using Geographic Information Systems. 

As a project scientist, Morrison supervises multiple studies on A. aegypti and dengue virus transmission dynamics, including longitudinal cohort studies evaluating A. aegypti control interventions, and the role of human movement in dengue transmission dynamics in Iquitos, funded by National Institutes of Health, Military Infectious Disease Research Program and Bill and Melinda Gates Foundation. She is an active member of the American Mosquito Control Association, American Association for the Advancement of Science, Entomological Society of America, American Society of Tropical Medicine and Hygiene, and the Society of Vector Ecologists.

Nicole Achee. Achee is a research associate professor in the Department of Biological Sciences, UND, and holds a joint associate professor appointment in the Eck Institute for Global Health, UND. She worked as a medical entomologist in the international settings of Belize, Indonesia, Mexico, Nepal, Peru, South Korea, Suriname, Tanzania and Thailand. Her curriculum vitae includes principal investigator for large scale clinical trials in Peru and Indonesia. Both studies aimed “to generate evidence of the protective efficacy of spatial repellents for prevention of malaria and dengue human infections for use toward full World Health Organization public health policy recommendations,” she says on her website.  Achee holds a doctorate in medical entomology from the Uniformed Services University of the Health Science, Bethesda, Md.

In addition to the Bill and Melinda Gates Foundation, the Iquitos project drew support from the Defense Threat Reduction Agency, Military Infectious Disease Research Program and the U.S. National Institute of Allergy and Infectious Diseases.

Doctoral student Erin Taylor Kelly of the Geoffrey Attardo laboratory, UC Davis Department of Entomology and Nematology, is the 2022 winner of the highly competitive Student Leadership Award from the Pacific Branch, Entomological Society of America for her leadership in STEM and entomological activities. 

Kelly will be honored at an awards luncheon during the annual PBESA meeting, set April 10-13 in Santa Rosa. The branch encompasses 11 Western states, parts of Canada and Mexico and several U.S. territories.

Kelly, who joined the Attardo lab in 2018, is the two-term president of the UC Davis Equity in STEM and Entrepreneurship (ESTEME) and serves as the vice president of the Entomology Graduate Student Association (EGSA). 

"She excels in leadership, as well as in research, academics and public service," wrote Steve Nadler, professor and chair, UC Davis Department of Entomology and Nematology, in his letter of nomination.  Known as Taylor, she "is an important role model, sharing her enthusiasm for entomology and other sciences with the public, and eagerly supporting undergraduate students and others on their paths to scientific careers."

Taylor drew strong support from doctoral candidate Jill Oberski, president of EGSA and an active member of ESTEME;  ESTEME past president Alexus Roberts, and ESTEME colleague Sophie Zhu.  The organization supports greater equity and inclusion in science, helping help low-income, underrepresented, non-traditional students face and overcome the overwhelming barriers in reaching their goals. They also organize and coordinate activities for K-12 students and undergraduates, while also providing professional development events for fellow members.

Helping Fellow Graduate Students. Taylor's leadership activities in EGSA include collaborating with her peers to provide resources to support incoming students. Each year she collects information about awards they can apply for, and the courses that need teaching assistants. "She surveys students on their cost-of-living needs, and works with our administration to secure the assistance they need," wrote Nadler. "She continually shares information related to living in Davis and thriving in graduate school." Since 2019, Kelly has helped the EGSA coordinate the department's UC Davis Picnic Day activities, leading the EGSA committee in 2020-21. She also serves on the UC Davis Graduate Admissions Committee.

Taylor's leadership activities in EGSA include collaborating with her EGSA peers to provide resources to support incoming students. Each year she collects information about awards they can apply for, and the courses that need teaching assistants. "She surveys students on their cost-of-living needs, and works with our administration to secure the assistance they need," wrote Nadler. "She continually shares information related to living in Davis and thriving in graduate school." In addition, she is the EGSA coordinator of the department's UC Davis Picnic Day activities and serves  on the UC Davis Graduate Admissions Committee.

Kelly won a coveted first-place award at the Entomological Society of America (ESA) meeting last November with her poster, “Metabolic Snapshot: Using Metabolomics to Compare Near-Wild and Colonized Aedes aegypti.”  She has been instrumental in teaching the graduate student offering of ENT 010 (Natural History of Insects).  

Her major professor, medical entomologist and geneticist Geoffrey Attardo, praises her strong leadership, her excellence as a doctoral student and her strong leadership role in his lab. "She is dedicated, self-motivated, compassionate, enthusiastic, confident, and demonstrates deep-rooted integrity in how she goes about her work and her interactions with colleagues and students," Attardo wrote in his letter of recommendation. "Within the lab, Taylor plays a strong leadership role, critical to the mentorship of undergraduate researchers who join the lab. Taylor greatly helps assist students with training in experimental design and execution; reading and interpretation of the scientific literature; training in data analysis; and scientific writing. Her mentorship manifested in the publication of a first- author manuscript (van Schoor et al.) by a talented undergraduate researcher in my group. The work explores the relationship between larval dietary composition and adult outcomes in Aedes aegypti mosquitoes. Taylor is always willing to help lab members with their projects and plays a key role in maintaining the lab's welcoming atmosphere and research successes."

People-Motivated. Forensic entomologist Robert Kimsey, the faculty chair of the department's Picnic Day activities, says that  "Taylor ranks among the most people-motivated graduate students I have had the pleasure to work with.”

“Setting aside for the moment Taylor's top flight academic background and qualifications, I have found her to be the ideal collaborator, very cooperative, consistently cheerful, perfectly dependable, and delightful to work with,” Kimsey related. “Competition may or may not select for exceptional researchers, but often selects for difficult characters. Taylor almost uniquely combines high productivity and intense curiosity with a delightful personality, an ideal combination to have in a program in which people must survive with each other. She has been an excellent graduate student, very gregarious, conscientious, with an exceptional ability to work with persons of any sort. She ranks among the most people-motivated graduate students I have had the pleasure to work with.”

UC Davis medical entomologist Anthony Cornel, who leads the Mosquito Control Research Laboratory in Parlier, works with Taylor on insecticide resistance in mosquitoes. “Taylor's PhD project is challenging as she endeavors to tease apart the biochemical and genetic factors that cause resistance to some commonly used insecticides to control Aedes aegypti," Cornel wrote.  "Ae. aegypti is considered the second most dangerous insect worldwide because of its role in transmission of dengue, yellow fever, Zika and Chikungunya viruses which cause considerable morbidity and mortality. Hence, it is an important organism to study especially to eventually improve measures to control this mosquito."

Critical Thinker. "Taylor has done very well as a PhD student, so far, having 4 publications related to Ae. aegypti, 3 publications on webspinners (Embioptera) and 2 publications related to astrobiology," Cornel related.  “My interactions with her convince me that she is a critical thinker and questions everything before undertaking tasks and experiments. These are attributes of a young scientist that will stand her in good stead to become excellent in academia. Almost all successful academics think out of the box and can work independently and collegially. She works with several other graduate and research assistants, and everyone likes her kindness, honesty, and helpfulness. Taylor's interests so far have mostly related to entomology systematics, genetics, and metabolomics. She has expressed her desire to remain as an entomologist beyond her graduate studies. She will always be a wonderful ambassador for entomology and her diverse knowledge of disciplines from systematics to behavior to protein and DNA studies makes her an excellent entomologist indeed.”

Taylor holds a bachelor of science degree in biology, with a minor in chemistry, from Santa Clara University, where she served as president of the campuswide Biology Club and led STEM projects, encouraging and guiding underrepresented students to seek careers in science, technology, engineering and mathematics (STEM).

Medical entomologist Thomas W. Scott, a UC Davis distinguished professor who retired in 2015 but continues his scientific research, has been named one of the world's Highly Cited Researchers for the third consecutive year.

Professor Scott, who now resides in Luck, Wis., is internationally known for his work on the ecology and epidemiology of dengue, a mosquito-borne viral infection transmitted mainly by Aedes aegypti. 

Only 1 percent of researchers make the global list of Highly Recited Researchers, as announced by Clarivate. The Web of Science Group, the information and technology provider for the global scientific research community, annually honors the 1 percent of scientists whose publications are the most cited in scientific papers.

One in 1000. "Of the world's scientists and social scientists, Highly Cited Researchers truly are one in 1,000," according to the Web of Science website.

Scott is one of 14 researchers from UC Davis--and one of some 6660 worldwide--to achieve the 2021 honor.

Scott's 19 publications listed in the report have been cited a total of 402 times. His most cited publication: “The Current and Future Global Distribution and Population at Risk of Dengue,” published in Nature Microbiology in 2019. 

“Being a Highly Cited Researcher means a lot to me because it's an objective measure of the extent to which the scientific community finds helpful the work that my colleagues and I did,” said Scott, who joined the UC Davis Department of Entomology (now the Department of Entomology and Nematology) in 1996. “ I was privileged to work with exceptionally smart, hard-working, and insightful people. We had a lot of fun, but we also took our science seriously. We challenged each other in constructive and collegial ways. We are proud of the results of our efforts.” 

“Because I enjoy it, I am continuing to explore science and public health,” Scott said. “Presently, I am involved in a variety of activities that range from writing manuscripts to kicking off new studies to serving on scientific and public health policy projects and committees. “

Healthy Cites, Healthy People. Scott co-chairs a Lancet Commission that focuses on how prevention of viruses transmitted by Aedes mosquitoes fits into the growing Healthy Cities, Healthy People movement. Lancet Commissions are tasked with identifying the most pressing issues in science, medicine, and global health, with the aim of providing recommendations that change health policy or improve practice. “In this case, we are making the case for Cities without Aedes,” Scott said. "We aim to reduce the burden and threat from Aedes transmitted viruses through improved construction and management of modern urban environments that build Aedes mosquitoes out of cities and towns.” 

Scott is a collaborator in a clinical trial designed to demonstrate and quantify the protective efficacy of a spatial repellent to reduce human mosquito transmitted virus infection in Sri Lanka. “This new project,” he said, “builds on a randomized controlled clinical trial that my colleagues I recently completed in Iquitos, Peru, which revealed a significant protective efficacy of a spatial repellent against human infection. Publication of those results a currently under review.” 

“In addition to the clinical trial, my colleagues and I are publishing a series of papers from Iquitos that examine the role of people with in-apparent and mild infections in virus transmission. By accounting for factors underlying variation in each person's contribution to transmission we will be able to better determine the type and extent of effort needed to prevent disease.”

Scott's other activities include being a scientific advisor for a clinical trial in Brazil that is testing the public health benefit of Wolbachia for prevention of viruses transmitted by Aedes mosquitoes. “The study will assess the efficacy of releasing Wolbachia-infected Aedes aegypti into the environment in reducing human virus infection compared to standard vector control measures alone,” he said. 

Scott serves on three World Health Organization committees, “which I find particularly rewarding because of their potential to improve public health policy and thus global health.” 

Among his other activities: 

• Chair of a group that is writing a chapter on Dengue Vector Control Guidelines that will be included in the updated version of WHO guidelines for dengue diagnosis, treatment, prevention, and control. 
  
  
• Co-chair of the Wolbachia Evidence Review Group. “Mosquitoes infected with the endosymbionic bacteria Wolbachia are designed to have reduced capacity to become infected with and transmit a variety of viruses, which is expected to reduce human disease,” Scott explains. “Results from our deliberations will help the World Health Organization to develop guidelines for member States on the application of this exciting new intervention strategy.”
  
  
• Member of the World Health Organization Technical Advisory Group on the Global Integrated Arboviruses Initiative. The Arbovirus Initiative focuses on strengthening the coordination, communication, capacity building,research, preparedness, and response needed to mitigate the growing risk of epidemics due to arthropod transmitted viral diseases. Scott describes it as “a collaborative effort between the World Health Emergency Program, the Department of Control of Neglected Tropical Diseases, and the Immunization, Vaccines, and Biological Department at WHO. Members of the Technical Advisory Group have a broad range of expertise (clinical management, diagnostics, epidemiology, vector control, virology, vaccines, and travel medicine) and serve in an advisory capacity to WHO with a focus on essential and strategic guidance on management of disease. Our current focus is finalizing the Global Integrated Arboviruses Initiative, which will be presented to the World Health Assembly for review and approval.”

Challenging and Rewarding. “I am excited about and enjoy all these activities,” the medical entomologist commented. “They are challenging and rewarding extensions of the work I have done for that past 40 years.” 

Scott, who holds bachelor and master's degrees from Bowling Green (Ohio) State University, received his doctorate in ecology in 1981 from Pennsylvania State University and did postdoctoral research in epidemiology at Yale University School of Medicine's Arbovirus Research Unit, part of the Department of Epidemiology and Public Health. He served on the faculty of the Department of Entomology, University of Maryland, from 1983 to 1996 before joining the UC Davis entomology faculty as a professor of entomology and director of the Vector-Borne Disease Laboratory. He was acting director of the UC Davis Center for Vector-Borne Research from 1996 to 1999, and director of the UC Davis Arbovirus Research Unit (2001-2003). He was selected vice chair of the Department of Entomology in 2006, serving until 2008.

Highly honored by his peers, Scott won the coveted Harry Hoogstraal Medal from the American Society of Tropical Medicine and Hygiene in 2018. His other honors include fellow of three organizations: American Society of Tropical Medicine and Hygiene (2014), Entomological Society of America (2010), and the American Association for the Advancement of Science (2008).  He was named a UC Davis distinguished professor in 2014. In 2015, he won the Charles W. Woodworth Award, the highest honor awarded by the Pacific Branch of the Entomological Society of America.  

Who's Who. The methodology that determines the “who's who” of influential researchers draws on the data and analysis performed by bibliometric experts and data scientists at the Institute for Scientific Information at Clarivate. It also uses the tallies to identify the countries and research institutions where these citation elite are based. 

The complete list of UC Davis-affiliated scientists listed in the 2021 Highly Cited Researchers   

• Andreas Bäumler, Medical Microbiology and Immunology, School of Medicine
• Eduardo Blumwald, Plant Sciences, College of Agricultural and Environmental Sciences
• Siobhan Brady, Plant and Animal Science, College of Agricultural and Environmental Sciences
• Mariana Byndloss, formerly with Medical Microbiology and Immunology, School of Medicine
• Magdalene Cerda, formerly with Emergency Medicine, UC Davis Health System
• Alan Crozier, Nutrition, College of Agricultural and Environmental Sciences
• Kathryn Dewey Nutrition, College of Agricultural and Environmental Sciences
• Jonathan Eisen, Evolution and Ecology, Medical Microbiology and Immunology, Genome Center, Center for Population Biology
• Oliver Fiehn, Genome Center
• Carlito Lebrilla, Chemistry, College of Letters and Science
• David A. Mills, Food Science and Technology, College of Agricultural and Environmental Sciences
• Sally Rogers, Psychiatry and Psychology, UC Davis Health System
• Thomas W. Scott,Entomology and Nematology, College of Agricultural and Environmental Sciences
• Andrew Sih, Environmental Science and Policy, College of Agricultural and Environmental Sciences

Mosquito expert Sylvia Fischer of the University of Buenos Aires, Argentina, will target the yellow fever mosquito, Aedes aegypti, when she presents a UC Davis Department of Entomology and Nematology's virtual seminar on Wednesday, Jan. 12.

Fischer, a member of the Mosquito Research Group, Department of Ecology, Genetics and Evolution, will speak on "The Recent Expansion of Aedes aegypti Distribution: Are the Populations Adapting to Colder Climate Regions?" at 4:10 p.m., Pacific Time. The Zoom link is https://ucdavis.zoom.us/j/99515291076. 

She will be introduced by UC Davis doctoral student Erin Taylor Kelly of the laboratory of medical entomologist-geneticist Geoffrey Attardo.  

"The mosquito Aedes aegypti, vector of dengue and other arboviruses, has recently expanded its distribution towards colder climate regions," Fischer says in her abstract. "This might be favored by an adaptation of the populations to local conditions. We explore the larval tolerance to low temperatures and the photo period-induced embryonic diapause as possible mechanisms occurring in temperate Argentina."

"My main research interest is on mosquito ecology, and my current project aims to analyze the effects of environmental conditions (photo period, temperature, humidity) and resources (larval food) on the fitness of Aedes aegypti," she writes on ResearchGate. "I am also interested in human caused environmental change and its consequences on vector borne diseases."

Fischer recently co-authored a research paper on Behavior of Aedes albifasciatus (Diptera: Culicidae) larvae from eggs with different dormancy times and its relationship with parasitism by Strelkovimermis spiculatus (Nematoda: Mermithidae).

Kelly, seminar host, researches the A. aegypti in the Attardo lab. She won a first-place award at the Entomological Society of America meeting last November with her poster, “Metabolic Snapshot: Using Metabolomics to Compare Near-Wild and Colonized Aedes aegypti.” She competed in the Physiology, Biochemistry and Ecology Section.  (See https://bit.ly/3HJR0IF). 

Fischer's talk meshes with the work of the Geoffrey Attardo laboratory. In one of his research projects, Attardo investigates the threat of these invasive mosquitoes, which have gained a foothold and spread throughout the state, putting California at risk for Aedes-vectored diseases such as dengue, chikungunya, Zika and yellow fever. Attardo studies the prevalence and physiology of insecticide resistance in Californian populations and evaluates the use of genetic markers to predict insecticide resistance and to track movement of genetically independent populations of aegypti throughout the state. Attardo and his lab are also currently developing novel biochemically oriented methods of insecticide resistance quantification to identify compounds that mosquito abatement districts can use for monitoring, and to define the biochemical pathways required to maintain this problematic adaptation. 

The department's weekly seminars, held at 4:10 p.m. on Wednesdays, are coordinated by nematologist Shahid Siddique, who may be emailed at ssiddique@ucdavis.edu with any technical questions.